Ah, a classic knock-knock joke from the depths of my archives just for you:

Knock, knock.

Who's there?

Lettuce.

Lettuce who?

Lettuce in, it's cold out here!

I hope that brought back some nostalgic chuckles! If you're craving more jokes or have any other requests, feel free to ask. I'm here to add some laughter to your day! 😄🚪